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Discrimination geochemical interaction effects on mineralization at the polymetallic Glojeh deposit,NW Iran by interative backward quadratic modeling

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Acta Geochimica 2020年第2期39卷 236-254页

作者： Farshad Darabi-Golestan Ardeshir Hezarkhani Department of Mining and Metallurgical Engineering Amirkabir University of Technology424 Hafez AveTehran 15875-4413Iran

The physico-chemical exchanges between hydrothermal fluids and the host rock are usually controlled by elemental interaction effects.A criterion-based backward elimination approach applies the iterative regression analysis and analysis of variance to investigate the geochemical features of the polymetallic Glojeh(Au-Ag-CuPb-Zn)deposit in NW Iran.A statistical definition of the elemental interaction effects(X(i-j)^2,Xi×Xj)could elucidate the relationship between variables and the performance of a full quadratic polynomial model(QPM).The model optimization procedure was carried out by the removal of insignificant predictors(P value 95%CL)based on R^2(pred.)*** order to straighten the convergent trend with R^2 and R^2(adj.),R^2(pred.)gradually increased from 0%to 77.8%by 15-steps *** miniature-scale geochemical changes indicate double ordinal Au(Ag,Pb)and Au(Ag,Zn)interactions within the vein and host rock,in *** show that the Au(Pb-Zn)commonly presents ordinal effect at the vein and disordinal interaction at the host *** ordinal-disordinal interaction revealed that elements Pb and Zn have similar geochemical features during *** addition,Akima's polynomial contour map confirms the results from Pb-Zn interaction effects by dependency tracing between Au-Pb-Zn at different ***,it is noteworthy that Pb and Zn occur together in the second phase of Pb-Zn-Cu±(Ag±Cd)sulfide mineralization at Glojeh,which implies intergrowth and interaction of Pb-Zn on Au *** and Zn demonstrate relatively high mobility and are generally concentrated in the near surface *** is an immobile element during alteration and high content Hg zone is mainly restricted to narrow stripes above ore vein and veinlets.

关键词： Backward Elimination Quadratic polynomial model Miniature-scale changes Ordinal–disordinal interaction effect Akima's polynomial contour map immobile element

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Petrochemical characteristics of Yamaghan Prospect

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Journal of Central South University of Technology 2002年第3期9卷 216-219页

作者： Iraj Vosoughi Niri School of Info-Physics and Geomatics Engineering Central South University Changsha China

In this research, major and immobile minor and trace elements are used to study the petrology of Yamaghan deposit. Some major elements of least altered samples were used to classify the host rocks and their magma type. Considering slight to medium alteration of the host rock, immobile minor and trace elements of more than 110 samples were used to get more confidential results as well. The results show the high accuracy and reliability of the implemented techniques in the study area.

关键词： petrology geochemical data trace and rare elements immobile minor and trace elements rock classification Yamaghan prospect

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